1213554505421 has 8 divisors (see below), whose sum is σ = 1277473718400. Its totient is φ = 1149640084800.

The previous prime is 1213554505391. The next prime is 1213554505439. The reversal of 1213554505421 is 1245054553121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213554505421 - 2³⁸ = 938676598477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213554505451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672380 + ... + 1696821.

It is an arithmetic number, because the mean of its divisors is an integer number (159684214800).

Almost surely, 2^{1213554505421} is an apocalyptic number.

It is an amenable number.

1213554505421 is a deficient number, since it is larger than the sum of its proper divisors (63919212979).

1213554505421 is a wasteful number, since it uses less digits than its factorization.

1213554505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396179.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 1213554505421 in words is "one trillion, two hundred thirteen billion, five hundred fifty-four million, five hundred five thousand, four hundred twenty-one".